static int jffs2_flash_setup(struct jffs2_sb_info *c) {
int ret = 0;
if (jffs2_cleanmarker_oob(c)) {
/* NAND flash... do setup accordingly */
ret = jffs2_nand_flash_setup(c);
if (ret)
return ret;
}
/* add setups for other bizarre flashes here... */
if (jffs2_nor_ecc(c)) {
ret = jffs2_nor_ecc_flash_setup(c);
if (ret)
return ret;
}
/* and Dataflash */
if (jffs2_dataflash(c)) {
ret = jffs2_dataflash_setup(c);
if (ret)
return ret;
}
/* and Intel "Sibley" flash */
if (jffs2_nor_wbuf_flash(c)) {
ret = jffs2_nor_wbuf_flash_setup(c);
if (ret)
return ret;
}
return ret;
}
void jffs2_flash_cleanup(struct jffs2_sb_info *c) {
if (jffs2_cleanmarker_oob(c)) {
jffs2_nand_flash_cleanup(c);
}
/* add cleanups for other bizarre flashes here... */
if (jffs2_nor_ecc(c)) {
jffs2_nor_ecc_flash_cleanup(c);
}
}
void jffs2_flash_cleanup(struct jffs2_sb_info *c) {
if (jffs2_cleanmarker_oob(c)) {
jffs2_nand_flash_cleanup(c);
}
/* add cleanups for other bizarre flashes here... */
if (jffs2_nor_ecc(c)) {
jffs2_nor_ecc_flash_cleanup(c);
}
/* and DataFlash */
if (jffs2_dataflash(c)) {
jffs2_dataflash_cleanup(c);
}
/* and Intel "Sibley" flash */
if (jffs2_nor_wbuf_flash(c)) {
jffs2_nor_wbuf_flash_cleanup(c);
}
}
/* Called with 'buf_size == 0' if buf is in fact a pointer _directly_ into
the flash, XIP-style */
static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s) {
struct jffs2_unknown_node *node;
struct jffs2_unknown_node crcnode;
uint32_t ofs, prevofs, max_ofs;
uint32_t hdr_crc, buf_ofs, buf_len;
int err;
int noise = 0;
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
int cleanmarkerfound = 0;
#endif
ofs = jeb->offset;
prevofs = jeb->offset - 1;
D1(printk(KERN_DEBUG "jffs2_scan_eraseblock(): Scanning block at 0x%x\n", ofs));
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
if (c->mtd->type == MTD_NANDFLASH) {
int ret;
if (c->mtd->block_isbad(c->mtd, jeb->offset))
return BLK_STATE_BADBLOCK;
if (jffs2_cleanmarker_oob(c)) {
ret = jffs2_check_nand_cleanmarker(c, jeb);
D2(printk(KERN_NOTICE "jffs_check_nand_cleanmarker returned %d\n", ret));
/* Even if it's not found, we still scan to see
if the block is empty. We use this information
to decide whether to erase it or not. */
switch (ret) {
case 0: cleanmarkerfound = 1; break;
case 1: break;
default: return ret;
}
}
}
#endif
if (jffs2_sum_active()) {
struct jffs2_sum_marker *sm;
void *sumptr = NULL;
uint32_t sumlen;
if (!buf_size) {
/* XIP case. Just look, point at the summary if it's there */
sm = (void *)buf + c->sector_size - sizeof(*sm);
if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) {
sumptr = buf + je32_to_cpu(sm->offset);
sumlen = c->sector_size - je32_to_cpu(sm->offset);
}
} else {
/* If NAND flash, read a whole page of it. Else just the end */
if (c->wbuf_pagesize)
buf_len = c->wbuf_pagesize;
else
buf_len = sizeof(*sm);
/* Read as much as we want into the _end_ of the preallocated buffer */
err = jffs2_fill_scan_buf(c, buf + buf_size - buf_len,
jeb->offset + c->sector_size - buf_len,
buf_len);
if (err)
return err;
sm = (void *)buf + buf_size - sizeof(*sm);
if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) {
sumlen = c->sector_size - je32_to_cpu(sm->offset);
sumptr = buf + buf_size - sumlen;
/* Now, make sure the summary itself is available */
if (sumlen > buf_size) {
/* Need to kmalloc for this. */
sumptr = kmalloc(sumlen, GFP_KERNEL);
if (!sumptr)
return -ENOMEM;
memcpy(sumptr + sumlen - buf_len, buf + buf_size - buf_len, buf_len);
}
if (buf_len < sumlen) {
/* Need to read more so that the entire summary node is present */
err = jffs2_fill_scan_buf(c, sumptr,
jeb->offset + c->sector_size - sumlen,
sumlen - buf_len);
if (err)
return err;
}
}
}
if (sumptr) {
err = jffs2_sum_scan_sumnode(c, jeb, sumptr, sumlen, &pseudo_random);
if (buf_size && sumlen > buf_size)
kfree(sumptr);
/* If it returns with a real error, bail.
If it returns positive, that's a block classification
(i.e. BLK_STATE_xxx) so return that too.
If it returns zero, fall through to full scan. */
if (err)
return err;
}
}
buf_ofs = jeb->offset;
if (!buf_size) {
/* This is the XIP case -- we're reading _directly_ from the flash chip */
buf_len = c->sector_size;
} else {
buf_len = EMPTY_SCAN_SIZE(c->sector_size);
err = jffs2_fill_scan_buf(c, buf, buf_ofs, buf_len);
if (err)
return err;
}
/* We temporarily use 'ofs' as a pointer into the buffer/jeb */
ofs = 0;
max_ofs = EMPTY_SCAN_SIZE(c->sector_size);
/* Scan only EMPTY_SCAN_SIZE of 0xFF before declaring it's empty */
while(ofs < max_ofs && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF)
ofs += 4;
if (ofs == max_ofs) {
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
if (jffs2_cleanmarker_oob(c)) {
/* scan oob, take care of cleanmarker */
int ret = jffs2_check_oob_empty(c, jeb, cleanmarkerfound);
D2(printk(KERN_NOTICE "jffs2_check_oob_empty returned %d\n",ret));
switch (ret) {
case 0: return cleanmarkerfound ? BLK_STATE_CLEANMARKER : BLK_STATE_ALLFF;
case 1: return BLK_STATE_ALLDIRTY;
default: return ret;
}
}
#endif
D1(printk(KERN_DEBUG "Block at 0x%08x is empty (erased)\n", jeb->offset));
if (c->cleanmarker_size == 0)
return BLK_STATE_CLEANMARKER; /* don't bother with re-erase */
else
return BLK_STATE_ALLFF; /* OK to erase if all blocks are like this */
}
if (ofs) {
D1(printk(KERN_DEBUG "Free space at %08x ends at %08x\n", jeb->offset,
jeb->offset + ofs));
if ((err = jffs2_prealloc_raw_node_refs(c, jeb, 1)))
return err;
if ((err = jffs2_scan_dirty_space(c, jeb, ofs)))
return err;
}
/* Now ofs is a complete physical flash offset as it always was... */
ofs += jeb->offset;
noise = 10;
dbg_summary("no summary found in jeb 0x%08x. Apply original scan.\n",jeb->offset);
scan_more:
while(ofs < jeb->offset + c->sector_size) {
jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
/* Make sure there are node refs available for use */
err = jffs2_prealloc_raw_node_refs(c, jeb, 2);
if (err)
return err;
cond_resched();
if (ofs & 3) {
printk(KERN_WARNING "Eep. ofs 0x%08x not word-aligned!\n", ofs);
ofs = PAD(ofs);
continue;
}
if (ofs == prevofs) {
printk(KERN_WARNING "ofs 0x%08x has already been seen. Skipping\n", ofs);
if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
return err;
ofs += 4;
continue;
}
prevofs = ofs;
if (jeb->offset + c->sector_size < ofs + sizeof(*node)) {
D1(printk(KERN_DEBUG "Fewer than %zd bytes left to end of block. (%x+%x<%x+%zx) Not reading\n", sizeof(struct jffs2_unknown_node),
jeb->offset, c->sector_size, ofs, sizeof(*node)));
if ((err = jffs2_scan_dirty_space(c, jeb, (jeb->offset + c->sector_size)-ofs)))
return err;
break;
}
if (buf_ofs + buf_len < ofs + sizeof(*node)) {
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
D1(printk(KERN_DEBUG "Fewer than %zd bytes (node header) left to end of buf. Reading 0x%x at 0x%08x\n",
sizeof(struct jffs2_unknown_node), buf_len, ofs));
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
}
node = (struct jffs2_unknown_node *)&buf[ofs-buf_ofs];
if (*(uint32_t *)(&buf[ofs-buf_ofs]) == 0xffffffff) {
uint32_t inbuf_ofs;
uint32_t empty_start, scan_end;
empty_start = ofs;
ofs += 4;
scan_end = min_t(uint32_t, EMPTY_SCAN_SIZE(c->sector_size)/8, buf_len);
D1(printk(KERN_DEBUG "Found empty flash at 0x%08x\n", ofs));
more_empty:
inbuf_ofs = ofs - buf_ofs;
while (inbuf_ofs < scan_end) {
if (unlikely(*(uint32_t *)(&buf[inbuf_ofs]) != 0xffffffff)) {
printk(KERN_WARNING "Empty flash at 0x%08x ends at 0x%08x\n",
empty_start, ofs);
if ((err = jffs2_scan_dirty_space(c, jeb, ofs-empty_start)))
return err;
goto scan_more;
}
inbuf_ofs+=4;
ofs += 4;
}
/* Ran off end. */
D1(printk(KERN_DEBUG "Empty flash to end of buffer at 0x%08x\n", ofs));
/* If we're only checking the beginning of a block with a cleanmarker,
bail now */
if (buf_ofs == jeb->offset && jeb->used_size == PAD(c->cleanmarker_size) &&
c->cleanmarker_size && !jeb->dirty_size && !ref_next(jeb->first_node)) {
D1(printk(KERN_DEBUG "%d bytes at start of block seems clean... assuming all clean\n", EMPTY_SCAN_SIZE(c->sector_size)));
return BLK_STATE_CLEANMARKER;
}
if (!buf_size && (scan_end != buf_len)) {/* XIP/point case */
scan_end = buf_len;
goto more_empty;
}
/* See how much more there is to read in this eraseblock... */
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
if (!buf_len) {
/* No more to read. Break out of main loop without marking
this range of empty space as dirty (because it's not) */
D1(printk(KERN_DEBUG "Empty flash at %08x runs to end of block. Treating as free_space\n",
empty_start));
break;
}
/* point never reaches here */
scan_end = buf_len;
D1(printk(KERN_DEBUG "Reading another 0x%x at 0x%08x\n", buf_len, ofs));
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
goto more_empty;
}
if (ofs == jeb->offset && je16_to_cpu(node->magic) == KSAMTIB_CIGAM_2SFFJ) {
printk(KERN_WARNING "Magic bitmask is backwards at offset 0x%08x. Wrong endian filesystem?\n", ofs);
if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
return err;
ofs += 4;
continue;
}
if (je16_to_cpu(node->magic) == JFFS2_DIRTY_BITMASK) {
D1(printk(KERN_DEBUG "Dirty bitmask at 0x%08x\n", ofs));
if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
return err;
ofs += 4;
continue;
}
if (je16_to_cpu(node->magic) == JFFS2_OLD_MAGIC_BITMASK) {
printk(KERN_WARNING "Old JFFS2 bitmask found at 0x%08x\n", ofs);
printk(KERN_WARNING "You cannot use older JFFS2 filesystems with newer kernels\n");
if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
return err;
ofs += 4;
continue;
}
if (je16_to_cpu(node->magic) != JFFS2_MAGIC_BITMASK) {
/* OK. We're out of possibilities. Whinge and move on */
noisy_printk(&noise, "jffs2_scan_eraseblock(): Magic bitmask 0x%04x not found at 0x%08x: 0x%04x instead\n",
JFFS2_MAGIC_BITMASK, ofs,
je16_to_cpu(node->magic));
if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
return err;
ofs += 4;
continue;
}
/* We seem to have a node of sorts. Check the CRC */
crcnode.magic = node->magic;
crcnode.nodetype = cpu_to_je16( je16_to_cpu(node->nodetype) | JFFS2_NODE_ACCURATE);
crcnode.totlen = node->totlen;
hdr_crc = crc32(0, &crcnode, sizeof(crcnode)-4);
if (hdr_crc != je32_to_cpu(node->hdr_crc)) {
noisy_printk(&noise, "jffs2_scan_eraseblock(): Node at 0x%08x {0x%04x, 0x%04x, 0x%08x) has invalid CRC 0x%08x (calculated 0x%08x)\n",
ofs, je16_to_cpu(node->magic),
je16_to_cpu(node->nodetype),
je32_to_cpu(node->totlen),
je32_to_cpu(node->hdr_crc),
hdr_crc);
if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
return err;
ofs += 4;
continue;
}
if (ofs + je32_to_cpu(node->totlen) > jeb->offset + c->sector_size) {
/* Eep. Node goes over the end of the erase block. */
printk(KERN_WARNING "Node at 0x%08x with length 0x%08x would run over the end of the erase block\n",
ofs, je32_to_cpu(node->totlen));
printk(KERN_WARNING "Perhaps the file system was created with the wrong erase size?\n");
if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
return err;
ofs += 4;
continue;
}
if (!(je16_to_cpu(node->nodetype) & JFFS2_NODE_ACCURATE)) {
/* Wheee. This is an obsoleted node */
D2(printk(KERN_DEBUG "Node at 0x%08x is obsolete. Skipping\n", ofs));
if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
return err;
ofs += PAD(je32_to_cpu(node->totlen));
continue;
}
switch(je16_to_cpu(node->nodetype)) {
case JFFS2_NODETYPE_INODE:
if (buf_ofs + buf_len < ofs + sizeof(struct jffs2_raw_inode)) {
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
D1(printk(KERN_DEBUG "Fewer than %zd bytes (inode node) left to end of buf. Reading 0x%x at 0x%08x\n",
sizeof(struct jffs2_raw_inode), buf_len, ofs));
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
node = (void *)buf;
}
err = jffs2_scan_inode_node(c, jeb, (void *)node, ofs, s);
if (err) return err;
ofs += PAD(je32_to_cpu(node->totlen));
break;
case JFFS2_NODETYPE_DIRENT:
if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
D1(printk(KERN_DEBUG "Fewer than %d bytes (dirent node) left to end of buf. Reading 0x%x at 0x%08x\n",
je32_to_cpu(node->totlen), buf_len, ofs));
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
node = (void *)buf;
}
err = jffs2_scan_dirent_node(c, jeb, (void *)node, ofs, s);
if (err) return err;
ofs += PAD(je32_to_cpu(node->totlen));
break;
#ifdef CONFIG_JFFS2_FS_XATTR
case JFFS2_NODETYPE_XATTR:
if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
D1(printk(KERN_DEBUG "Fewer than %d bytes (xattr node)"
" left to end of buf. Reading 0x%x at 0x%08x\n",
je32_to_cpu(node->totlen), buf_len, ofs));
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
node = (void *)buf;
}
err = jffs2_scan_xattr_node(c, jeb, (void *)node, ofs, s);
if (err)
return err;
ofs += PAD(je32_to_cpu(node->totlen));
break;
case JFFS2_NODETYPE_XREF:
if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
D1(printk(KERN_DEBUG "Fewer than %d bytes (xref node)"
" left to end of buf. Reading 0x%x at 0x%08x\n",
je32_to_cpu(node->totlen), buf_len, ofs));
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
node = (void *)buf;
}
err = jffs2_scan_xref_node(c, jeb, (void *)node, ofs, s);
if (err)
return err;
ofs += PAD(je32_to_cpu(node->totlen));
break;
#endif /* CONFIG_JFFS2_FS_XATTR */
case JFFS2_NODETYPE_CLEANMARKER:
D1(printk(KERN_DEBUG "CLEANMARKER node found at 0x%08x\n", ofs));
if (je32_to_cpu(node->totlen) != c->cleanmarker_size) {
printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x has totlen 0x%x != normal 0x%x\n",
ofs, je32_to_cpu(node->totlen), c->cleanmarker_size);
if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node)))))
return err;
ofs += PAD(sizeof(struct jffs2_unknown_node));
} else if (jeb->first_node) {
printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x, not first node in block (0x%08x)\n", ofs, jeb->offset);
if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node)))))
return err;
ofs += PAD(sizeof(struct jffs2_unknown_node));
} else {
jffs2_link_node_ref(c, jeb, ofs | REF_NORMAL, c->cleanmarker_size, NULL);
ofs += PAD(c->cleanmarker_size);
}
break;
case JFFS2_NODETYPE_PADDING:
if (jffs2_sum_active())
jffs2_sum_add_padding_mem(s, je32_to_cpu(node->totlen));
if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
return err;
ofs += PAD(je32_to_cpu(node->totlen));
break;
default:
switch (je16_to_cpu(node->nodetype) & JFFS2_COMPAT_MASK) {
case JFFS2_FEATURE_ROCOMPAT:
printk(KERN_NOTICE "Read-only compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs);
c->flags |= JFFS2_SB_FLAG_RO;
if (!(jffs2_is_readonly(c)))
return -EROFS;
if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
return err;
ofs += PAD(je32_to_cpu(node->totlen));
break;
case JFFS2_FEATURE_INCOMPAT:
printk(KERN_NOTICE "Incompatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs);
return -EINVAL;
case JFFS2_FEATURE_RWCOMPAT_DELETE:
D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs));
if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
return err;
ofs += PAD(je32_to_cpu(node->totlen));
break;
case JFFS2_FEATURE_RWCOMPAT_COPY: {
D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs));
jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(node->totlen)), NULL);
/* We can't summarise nodes we don't grok */
jffs2_sum_disable_collecting(s);
ofs += PAD(je32_to_cpu(node->totlen));
break;
}
}
}
}
if (jffs2_sum_active()) {
if (PAD(s->sum_size + JFFS2_SUMMARY_FRAME_SIZE) > jeb->free_size) {
dbg_summary("There is not enough space for "
"summary information, disabling for this jeb!\n");
jffs2_sum_disable_collecting(s);
}
}
D1(printk(KERN_DEBUG "Block at 0x%08x: free 0x%08x, dirty 0x%08x, unchecked 0x%08x, used 0x%08x, wasted 0x%08x\n",
jeb->offset,jeb->free_size, jeb->dirty_size, jeb->unchecked_size, jeb->used_size, jeb->wasted_size));
/* mark_node_obsolete can add to wasted !! */
if (jeb->wasted_size) {
jeb->dirty_size += jeb->wasted_size;
c->dirty_size += jeb->wasted_size;
c->wasted_size -= jeb->wasted_size;
jeb->wasted_size = 0;
}
return jffs2_scan_classify_jeb(c, jeb);
}
int jffs2_scan_medium(struct jffs2_sb_info *c)
{
int i, ret;
uint32_t empty_blocks = 0, bad_blocks = 0;
unsigned char *flashbuf = NULL;
uint32_t buf_size = 0;
struct jffs2_summary *s = NULL; /* summary info collected by the scan process */
#ifndef __ECOS
size_t pointlen;
if (c->mtd->point) {
ret = c->mtd->point(c->mtd, 0, c->mtd->size, &pointlen,
(void **)&flashbuf, NULL);
if (!ret && pointlen < c->mtd->size) {
/* Don't muck about if it won't let us point to the whole flash */
D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", pointlen));
c->mtd->unpoint(c->mtd, 0, pointlen);
flashbuf = NULL;
}
if (ret)
D1(printk(KERN_DEBUG "MTD point failed %d\n", ret));
}
#endif
if (!flashbuf) {
/* For NAND it's quicker to read a whole eraseblock at a time,
apparently */
if (jffs2_cleanmarker_oob(c))
buf_size = c->sector_size;
else
buf_size = PAGE_SIZE;
/* Respect kmalloc limitations */
if (buf_size > 128*1024)
buf_size = 128*1024;
D1(printk(KERN_DEBUG "Allocating readbuf of %d bytes\n", buf_size));
flashbuf = kmalloc(buf_size, GFP_KERNEL);
if (!flashbuf)
return -ENOMEM;
}
if (jffs2_sum_active()) {
s = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL);
if (!s) {
JFFS2_WARNING("Can't allocate memory for summary\n");
ret = -ENOMEM;
goto out;
}
}
for (i=0; i<c->nr_blocks; i++) {
struct jffs2_eraseblock *jeb = &c->blocks[i];
cond_resched();
/* reset summary info for next eraseblock scan */
jffs2_sum_reset_collected(s);
ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset),
buf_size, s);
if (ret < 0)
goto out;
jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
/* Now decide which list to put it on */
switch(ret) {
case BLK_STATE_ALLFF:
/*
* Empty block. Since we can't be sure it
* was entirely erased, we just queue it for erase
* again. It will be marked as such when the erase
* is complete. Meanwhile we still count it as empty
* for later checks.
*/
empty_blocks++;
list_add(&jeb->list, &c->erase_pending_list);
c->nr_erasing_blocks++;
break;
case BLK_STATE_CLEANMARKER:
/* Only a CLEANMARKER node is valid */
if (!jeb->dirty_size) {
/* It's actually free */
list_add(&jeb->list, &c->free_list);
c->nr_free_blocks++;
} else {
/* Dirt */
D1(printk(KERN_DEBUG "Adding all-dirty block at 0x%08x to erase_pending_list\n", jeb->offset));
list_add(&jeb->list, &c->erase_pending_list);
c->nr_erasing_blocks++;
}
break;
case BLK_STATE_CLEAN:
/* Full (or almost full) of clean data. Clean list */
list_add(&jeb->list, &c->clean_list);
break;
case BLK_STATE_PARTDIRTY:
/* Some data, but not full. Dirty list. */
/* We want to remember the block with most free space
and stick it in the 'nextblock' position to start writing to it. */
if (jeb->free_size > min_free(c) &&
(!c->nextblock || c->nextblock->free_size < jeb->free_size)) {
/* Better candidate for the next writes to go to */
if (c->nextblock) {
ret = file_dirty(c, c->nextblock);
if (ret)
goto out;
/* deleting summary information of the old nextblock */
jffs2_sum_reset_collected(c->summary);
}
/* update collected summary information for the current nextblock */
jffs2_sum_move_collected(c, s);
D1(printk(KERN_DEBUG "jffs2_scan_medium(): new nextblock = 0x%08x\n", jeb->offset));
c->nextblock = jeb;
} else {
ret = file_dirty(c, jeb);
if (ret)
goto out;
}
break;
case BLK_STATE_ALLDIRTY:
/* Nothing valid - not even a clean marker. Needs erasing. */
/* For now we just put it on the erasing list. We'll start the erases later */
D1(printk(KERN_NOTICE "JFFS2: Erase block at 0x%08x is not formatted. It will be erased\n", jeb->offset));
list_add(&jeb->list, &c->erase_pending_list);
c->nr_erasing_blocks++;
break;
case BLK_STATE_BADBLOCK:
D1(printk(KERN_NOTICE "JFFS2: Block at 0x%08x is bad\n", jeb->offset));
list_add(&jeb->list, &c->bad_list);
c->bad_size += c->sector_size;
c->free_size -= c->sector_size;
bad_blocks++;
break;
default:
printk(KERN_WARNING "jffs2_scan_medium(): unknown block state\n");
BUG();
}
}
/* Nextblock dirty is always seen as wasted, because we cannot recycle it now */
if (c->nextblock && (c->nextblock->dirty_size)) {
c->nextblock->wasted_size += c->nextblock->dirty_size;
c->wasted_size += c->nextblock->dirty_size;
c->dirty_size -= c->nextblock->dirty_size;
c->nextblock->dirty_size = 0;
}
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
if (!jffs2_can_mark_obsolete(c) && c->wbuf_pagesize && c->nextblock && (c->nextblock->free_size % c->wbuf_pagesize)) {
/* If we're going to start writing into a block which already
contains data, and the end of the data isn't page-aligned,
skip a little and align it. */
uint32_t skip = c->nextblock->free_size % c->wbuf_pagesize;
D1(printk(KERN_DEBUG "jffs2_scan_medium(): Skipping %d bytes in nextblock to ensure page alignment\n",
skip));
jffs2_prealloc_raw_node_refs(c, c->nextblock, 1);
jffs2_scan_dirty_space(c, c->nextblock, skip);
}
#endif
if (c->nr_erasing_blocks) {
if ( !c->used_size && ((c->nr_free_blocks+empty_blocks+bad_blocks)!= c->nr_blocks || bad_blocks == c->nr_blocks) ) {
printk(KERN_NOTICE "Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes\n");
printk(KERN_NOTICE "empty_blocks %d, bad_blocks %d, c->nr_blocks %d\n",empty_blocks,bad_blocks,c->nr_blocks);
ret = -EIO;
goto out;
}
spin_lock(&c->erase_completion_lock);
jffs2_garbage_collect_trigger(c);
spin_unlock(&c->erase_completion_lock);
}
ret = 0;
out:
if (buf_size)
kfree(flashbuf);
#ifndef __ECOS
else
c->mtd->unpoint(c->mtd, 0, c->mtd->size);
#endif
if (s)
kfree(s);
return ret;
}
int jffs2_scan_medium(struct jffs2_sb_info *c)
{
int i, ret;
uint32_t empty_blocks = 0, bad_blocks = 0;
unsigned char *flashbuf = NULL;
uint32_t buf_size = 0;
#ifndef __ECOS
size_t pointlen;
if (c->mtd->point) {
ret = c->mtd->point (c->mtd, 0, c->mtd->size, &pointlen, &flashbuf);
if (!ret && pointlen < c->mtd->size) {
/* Don't muck about if it won't let us point to the whole flash */
D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", pointlen));
c->mtd->unpoint(c->mtd, flashbuf, 0, c->mtd->size);
flashbuf = NULL;
}
if (ret)
D1(printk(KERN_DEBUG "MTD point failed %d\n", ret));
}
#endif
if (!flashbuf) {
/* For NAND it's quicker to read a whole eraseblock at a time,
apparently */
if (jffs2_cleanmarker_oob(c))
buf_size = c->sector_size;
else
buf_size = PAGE_SIZE;
D1(printk(KERN_DEBUG "Allocating readbuf of %d bytes\n", buf_size));
flashbuf = kmalloc(buf_size, GFP_KERNEL);
if (!flashbuf)
return -ENOMEM;
}
for (i=0; i<c->nr_blocks; i++) {
struct jffs2_eraseblock *jeb = &c->blocks[i];
ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset), buf_size);
if (ret < 0)
return ret;
ACCT_PARANOIA_CHECK(jeb);
/* Now decide which list to put it on */
switch(ret) {
case BLK_STATE_ALLFF:
/*
* Empty block. Since we can't be sure it
* was entirely erased, we just queue it for erase
* again. It will be marked as such when the erase
* is complete. Meanwhile we still count it as empty
* for later checks.
*/
empty_blocks++;
list_add(&jeb->list, &c->erase_pending_list);
c->nr_erasing_blocks++;
break;
case BLK_STATE_CLEANMARKER:
/* Only a CLEANMARKER node is valid */
if (!jeb->dirty_size) {
/* It's actually free */
list_add(&jeb->list, &c->free_list);
c->nr_free_blocks++;
} else {
/* Dirt */
D1(printk(KERN_DEBUG "Adding all-dirty block at 0x%08x to erase_pending_list\n", jeb->offset));
list_add(&jeb->list, &c->erase_pending_list);
c->nr_erasing_blocks++;
}
break;
case BLK_STATE_CLEAN:
/* Full (or almost full) of clean data. Clean list */
list_add(&jeb->list, &c->clean_list);
break;
case BLK_STATE_PARTDIRTY:
/* Some data, but not full. Dirty list. */
/* Except that we want to remember the block with most free space,
and stick it in the 'nextblock' position to start writing to it.
Later when we do snapshots, this must be the most recent block,
not the one with most free space.
*/
if (jeb->free_size > 2*sizeof(struct jffs2_raw_inode) &&
(jffs2_can_mark_obsolete(c) || jeb->free_size > c->wbuf_pagesize) &&
(!c->nextblock || c->nextblock->free_size < jeb->free_size)) {
/* Better candidate for the next writes to go to */
if (c->nextblock) {
c->nextblock->dirty_size += c->nextblock->free_size + c->nextblock->wasted_size;
c->dirty_size += c->nextblock->free_size + c->nextblock->wasted_size;
c->free_size -= c->nextblock->free_size;
c->wasted_size -= c->nextblock->wasted_size;
c->nextblock->free_size = c->nextblock->wasted_size = 0;
if (VERYDIRTY(c, c->nextblock->dirty_size)) {
list_add(&c->nextblock->list, &c->very_dirty_list);
} else {
list_add(&c->nextblock->list, &c->dirty_list);
}
}
c->nextblock = jeb;
} else {
jeb->dirty_size += jeb->free_size + jeb->wasted_size;
c->dirty_size += jeb->free_size + jeb->wasted_size;
c->free_size -= jeb->free_size;
c->wasted_size -= jeb->wasted_size;
jeb->free_size = jeb->wasted_size = 0;
if (VERYDIRTY(c, jeb->dirty_size)) {
list_add(&jeb->list, &c->very_dirty_list);
} else {
list_add(&jeb->list, &c->dirty_list);
}
}
break;
case BLK_STATE_ALLDIRTY:
/* Nothing valid - not even a clean marker. Needs erasing. */
/* For now we just put it on the erasing list. We'll start the erases later */
D1(printk(KERN_NOTICE "JFFS2: Erase block at 0x%08x is not formatted. It will be erased\n", jeb->offset));
list_add(&jeb->list, &c->erase_pending_list);
c->nr_erasing_blocks++;
break;
case BLK_STATE_BADBLOCK:
D1(printk(KERN_NOTICE "JFFS2: Block at 0x%08x is bad\n", jeb->offset));
list_add(&jeb->list, &c->bad_list);
c->bad_size += c->sector_size;
c->free_size -= c->sector_size;
bad_blocks++;
break;
default:
printk(KERN_WARNING "jffs2_scan_medium(): unknown block state\n");
BUG();
}
}
/* Nextblock dirty is always seen as wasted, because we cannot recycle it now */
if (c->nextblock && (c->nextblock->dirty_size)) {
c->nextblock->wasted_size += c->nextblock->dirty_size;
c->wasted_size += c->nextblock->dirty_size;
c->dirty_size -= c->nextblock->dirty_size;
c->nextblock->dirty_size = 0;
}
if (!jffs2_can_mark_obsolete(c) && c->nextblock && (c->nextblock->free_size & (c->wbuf_pagesize-1))) {
/* If we're going to start writing into a block which already
contains data, and the end of the data isn't page-aligned,
skip a little and align it. */
uint32_t skip = c->nextblock->free_size & (c->wbuf_pagesize-1);
D1(printk(KERN_DEBUG "jffs2_scan_medium(): Skipping %d bytes in nextblock to ensure page alignment\n",
skip));
c->nextblock->wasted_size += skip;
c->wasted_size += skip;
c->nextblock->free_size -= skip;
c->free_size -= skip;
}
if (c->nr_erasing_blocks) {
if ( !c->used_size && ((empty_blocks+bad_blocks)!= c->nr_blocks || bad_blocks == c->nr_blocks) ) {
printk(KERN_NOTICE "Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes\n");
printk(KERN_NOTICE "empty_blocks %d, bad_blocks %d, c->nr_blocks %d\n",empty_blocks,bad_blocks,c->nr_blocks);
return -EIO;
}
jffs2_erase_pending_trigger(c);
}
if (buf_size)
kfree(flashbuf);
#ifndef __ECOS
else
c->mtd->unpoint(c->mtd, flashbuf, 0, c->mtd->size);
#endif
return 0;
}
static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
unsigned char *buf, uint32_t buf_size) {
struct jffs2_unknown_node *node;
struct jffs2_unknown_node crcnode;
uint32_t ofs, prevofs;
uint32_t hdr_crc, buf_ofs, buf_len;
int err;
int noise = 0;
int wasempty = 0;
uint32_t empty_start = 0;
#ifdef CONFIG_JFFS2_FS_NAND
int cleanmarkerfound = 0;
#endif
ofs = jeb->offset;
prevofs = jeb->offset - 1;
D1(printk(KERN_DEBUG "jffs2_scan_eraseblock(): Scanning block at 0x%x\n", ofs));
#ifdef CONFIG_JFFS2_FS_NAND
if (jffs2_cleanmarker_oob(c)) {
int ret = jffs2_check_nand_cleanmarker(c, jeb);
D2(printk(KERN_NOTICE "jffs_check_nand_cleanmarker returned %d\n",ret));
/* Even if it's not found, we still scan to see
if the block is empty. We use this information
to decide whether to erase it or not. */
switch (ret) {
case 0: cleanmarkerfound = 1; break;
case 1: break;
case 2: return BLK_STATE_BADBLOCK;
case 3: return BLK_STATE_ALLDIRTY; /* Block has failed to erase min. once */
default: return ret;
}
}
#endif
buf_ofs = jeb->offset;
if (!buf_size) {
buf_len = c->sector_size;
} else {
buf_len = EMPTY_SCAN_SIZE;
err = jffs2_fill_scan_buf(c, buf, buf_ofs, buf_len);
if (err)
return err;
}
/* We temporarily use 'ofs' as a pointer into the buffer/jeb */
ofs = 0;
/* Scan only 4KiB of 0xFF before declaring it's empty */
while(ofs < EMPTY_SCAN_SIZE && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF)
ofs += 4;
if (ofs == EMPTY_SCAN_SIZE) {
#ifdef CONFIG_JFFS2_FS_NAND
if (jffs2_cleanmarker_oob(c)) {
/* scan oob, take care of cleanmarker */
int ret = jffs2_check_oob_empty(c, jeb, cleanmarkerfound);
D2(printk(KERN_NOTICE "jffs2_check_oob_empty returned %d\n",ret));
switch (ret) {
case 0: return cleanmarkerfound ? BLK_STATE_CLEANMARKER : BLK_STATE_ALLFF;
case 1: return BLK_STATE_ALLDIRTY;
case 2: return BLK_STATE_BADBLOCK; /* case 2/3 are paranoia checks */
case 3: return BLK_STATE_ALLDIRTY; /* Block has failed to erase min. once */
default: return ret;
}
}
#endif
D1(printk(KERN_DEBUG "Block at 0x%08x is empty (erased)\n", jeb->offset));
return BLK_STATE_ALLFF; /* OK to erase if all blocks are like this */
}
if (ofs) {
D1(printk(KERN_DEBUG "Free space at %08x ends at %08x\n", jeb->offset,
jeb->offset + ofs));
DIRTY_SPACE(ofs);
}
/* Now ofs is a complete physical flash offset as it always was... */
ofs += jeb->offset;
noise = 10;
while(ofs < jeb->offset + c->sector_size) {
D1(ACCT_PARANOIA_CHECK(jeb));
cond_resched();
if (ofs & 3) {
printk(KERN_WARNING "Eep. ofs 0x%08x not word-aligned!\n", ofs);
ofs = (ofs+3)&~3;
continue;
}
if (ofs == prevofs) {
printk(KERN_WARNING "ofs 0x%08x has already been seen. Skipping\n", ofs);
DIRTY_SPACE(4);
ofs += 4;
continue;
}
prevofs = ofs;
if (jeb->offset + c->sector_size < ofs + sizeof(*node)) {
D1(printk(KERN_DEBUG "Fewer than %zd bytes left to end of block. (%x+%x<%x+%zx) Not reading\n", sizeof(struct jffs2_unknown_node),
jeb->offset, c->sector_size, ofs, sizeof(*node)));
DIRTY_SPACE((jeb->offset + c->sector_size)-ofs);
break;
}
if (buf_ofs + buf_len < ofs + sizeof(*node)) {
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
D1(printk(KERN_DEBUG "Fewer than %zd bytes (node header) left to end of buf. Reading 0x%x at 0x%08x\n",
sizeof(struct jffs2_unknown_node), buf_len, ofs));
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
}
node = (struct jffs2_unknown_node *)&buf[ofs-buf_ofs];
if (*(uint32_t *)(&buf[ofs-buf_ofs]) == 0xffffffff) {
uint32_t inbuf_ofs = ofs - buf_ofs + 4;
uint32_t scanend;
empty_start = ofs;
ofs += 4;
/* If scanning empty space after only a cleanmarker, don't
bother scanning the whole block */
if (unlikely(empty_start == jeb->offset + c->cleanmarker_size &&
jeb->offset + EMPTY_SCAN_SIZE < buf_ofs + buf_len))
scanend = jeb->offset + EMPTY_SCAN_SIZE - buf_ofs;
else
scanend = buf_len;
D1(printk(KERN_DEBUG "Found empty flash at 0x%08x\n", ofs));
while (inbuf_ofs < scanend) {
if (*(uint32_t *)(&buf[inbuf_ofs]) != 0xffffffff)
goto emptyends;
inbuf_ofs+=4;
ofs += 4;
}
/* Ran off end. */
D1(printk(KERN_DEBUG "Empty flash ends normally at 0x%08x\n", ofs));
if (buf_ofs == jeb->offset && jeb->used_size == PAD(c->cleanmarker_size) &&
!jeb->first_node->next_in_ino && !jeb->dirty_size)
return BLK_STATE_CLEANMARKER;
wasempty = 1;
continue;
} else if (wasempty) {
emptyends:
printk(KERN_WARNING "Empty flash at 0x%08x ends at 0x%08x\n", empty_start, ofs);
DIRTY_SPACE(ofs-empty_start);
wasempty = 0;
continue;
}
if (ofs == jeb->offset && je16_to_cpu(node->magic) == KSAMTIB_CIGAM_2SFFJ) {
printk(KERN_WARNING "Magic bitmask is backwards at offset 0x%08x. Wrong endian filesystem?\n", ofs);
DIRTY_SPACE(4);
ofs += 4;
continue;
}
if (je16_to_cpu(node->magic) == JFFS2_DIRTY_BITMASK) {
D1(printk(KERN_DEBUG "Empty bitmask at 0x%08x\n", ofs));
DIRTY_SPACE(4);
ofs += 4;
continue;
}
if (je16_to_cpu(node->magic) == JFFS2_OLD_MAGIC_BITMASK) {
printk(KERN_WARNING "Old JFFS2 bitmask found at 0x%08x\n", ofs);
printk(KERN_WARNING "You cannot use older JFFS2 filesystems with newer kernels\n");
DIRTY_SPACE(4);
ofs += 4;
continue;
}
if (je16_to_cpu(node->magic) != JFFS2_MAGIC_BITMASK) {
/* OK. We're out of possibilities. Whinge and move on */
noisy_printk(&noise, "jffs2_scan_eraseblock(): Magic bitmask 0x%04x not found at 0x%08x: 0x%04x instead\n",
JFFS2_MAGIC_BITMASK, ofs,
je16_to_cpu(node->magic));
DIRTY_SPACE(4);
ofs += 4;
continue;
}
/* We seem to have a node of sorts. Check the CRC */
crcnode.magic = node->magic;
crcnode.nodetype = cpu_to_je16( je16_to_cpu(node->nodetype) | JFFS2_NODE_ACCURATE);
crcnode.totlen = node->totlen;
hdr_crc = crc32(0, &crcnode, sizeof(crcnode)-4);
if (hdr_crc != je32_to_cpu(node->hdr_crc)) {
noisy_printk(&noise, "jffs2_scan_eraseblock(): Node at 0x%08x {0x%04x, 0x%04x, 0x%08x) has invalid CRC 0x%08x (calculated 0x%08x)\n",
ofs, je16_to_cpu(node->magic),
je16_to_cpu(node->nodetype),
je32_to_cpu(node->totlen),
je32_to_cpu(node->hdr_crc),
hdr_crc);
DIRTY_SPACE(4);
ofs += 4;
continue;
}
if (ofs + je32_to_cpu(node->totlen) >
jeb->offset + c->sector_size) {
/* Eep. Node goes over the end of the erase block. */
printk(KERN_WARNING "Node at 0x%08x with length 0x%08x would run over the end of the erase block\n",
ofs, je32_to_cpu(node->totlen));
printk(KERN_WARNING "Perhaps the file system was created with the wrong erase size?\n");
DIRTY_SPACE(4);
ofs += 4;
continue;
}
if (!(je16_to_cpu(node->nodetype) & JFFS2_NODE_ACCURATE)) {
/* Wheee. This is an obsoleted node */
D2(printk(KERN_DEBUG "Node at 0x%08x is obsolete. Skipping\n", ofs));
DIRTY_SPACE(PAD(je32_to_cpu(node->totlen)));
ofs += PAD(je32_to_cpu(node->totlen));
continue;
}
switch(je16_to_cpu(node->nodetype)) {
case JFFS2_NODETYPE_INODE:
if (buf_ofs + buf_len < ofs + sizeof(struct jffs2_raw_inode)) {
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
D1(printk(KERN_DEBUG "Fewer than %zd bytes (inode node) left to end of buf. Reading 0x%x at 0x%08x\n",
sizeof(struct jffs2_raw_inode), buf_len, ofs));
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
node = (void *)buf;
}
err = jffs2_scan_inode_node(c, jeb, (void *)node, ofs);
if (err) return err;
ofs += PAD(je32_to_cpu(node->totlen));
break;
case JFFS2_NODETYPE_DIRENT:
if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
D1(printk(KERN_DEBUG "Fewer than %d bytes (dirent node) left to end of buf. Reading 0x%x at 0x%08x\n",
je32_to_cpu(node->totlen), buf_len, ofs));
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
node = (void *)buf;
}
err = jffs2_scan_dirent_node(c, jeb, (void *)node, ofs);
if (err) return err;
ofs += PAD(je32_to_cpu(node->totlen));
break;
case JFFS2_NODETYPE_CLEANMARKER:
D1(printk(KERN_DEBUG "CLEANMARKER node found at 0x%08x\n", ofs));
if (je32_to_cpu(node->totlen) != c->cleanmarker_size) {
printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x has totlen 0x%x != normal 0x%x\n",
ofs, je32_to_cpu(node->totlen), c->cleanmarker_size);
DIRTY_SPACE(PAD(sizeof(struct jffs2_unknown_node)));
ofs += PAD(sizeof(struct jffs2_unknown_node));
} else if (jeb->first_node) {
printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x, not first node in block (0x%08x)\n", ofs, jeb->offset);
DIRTY_SPACE(PAD(sizeof(struct jffs2_unknown_node)));
ofs += PAD(sizeof(struct jffs2_unknown_node));
} else {
struct jffs2_raw_node_ref *marker_ref = jffs2_alloc_raw_node_ref();
if (!marker_ref) {
printk(KERN_NOTICE "Failed to allocate node ref for clean marker\n");
return -ENOMEM;
}
marker_ref->next_in_ino = NULL;
marker_ref->next_phys = NULL;
marker_ref->flash_offset = ofs | REF_NORMAL;
marker_ref->totlen = c->cleanmarker_size;
jeb->first_node = jeb->last_node = marker_ref;
USED_SPACE(PAD(c->cleanmarker_size));
ofs += PAD(c->cleanmarker_size);
}
break;
case JFFS2_NODETYPE_PADDING:
DIRTY_SPACE(PAD(je32_to_cpu(node->totlen)));
ofs += PAD(je32_to_cpu(node->totlen));
break;
default:
switch (je16_to_cpu(node->nodetype) & JFFS2_COMPAT_MASK) {
case JFFS2_FEATURE_ROCOMPAT:
printk(KERN_NOTICE "Read-only compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs);
c->flags |= JFFS2_SB_FLAG_RO;
if (!(jffs2_is_readonly(c)))
return -EROFS;
DIRTY_SPACE(PAD(je32_to_cpu(node->totlen)));
ofs += PAD(je32_to_cpu(node->totlen));
break;
case JFFS2_FEATURE_INCOMPAT:
printk(KERN_NOTICE "Incompatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs);
return -EINVAL;
case JFFS2_FEATURE_RWCOMPAT_DELETE:
D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs));
DIRTY_SPACE(PAD(je32_to_cpu(node->totlen)));
ofs += PAD(je32_to_cpu(node->totlen));
break;
case JFFS2_FEATURE_RWCOMPAT_COPY:
D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs));
USED_SPACE(PAD(je32_to_cpu(node->totlen)));
ofs += PAD(je32_to_cpu(node->totlen));
break;
}
}
}
D1(printk(KERN_DEBUG "Block at 0x%08x: free 0x%08x, dirty 0x%08x, unchecked 0x%08x, used 0x%08x\n", jeb->offset,
jeb->free_size, jeb->dirty_size, jeb->unchecked_size, jeb->used_size));
/* mark_node_obsolete can add to wasted !! */
if (jeb->wasted_size) {
jeb->dirty_size += jeb->wasted_size;
c->dirty_size += jeb->wasted_size;
c->wasted_size -= jeb->wasted_size;
jeb->wasted_size = 0;
}
if ((jeb->used_size + jeb->unchecked_size) == PAD(c->cleanmarker_size) && !jeb->dirty_size
&& (!jeb->first_node || jeb->first_node->next_in_ino) )
return BLK_STATE_CLEANMARKER;
/* move blocks with max 4 byte dirty space to cleanlist */
else if (!ISDIRTY(c->sector_size - (jeb->used_size + jeb->unchecked_size))) {
c->dirty_size -= jeb->dirty_size;
c->wasted_size += jeb->dirty_size;
jeb->wasted_size += jeb->dirty_size;
jeb->dirty_size = 0;
return BLK_STATE_CLEAN;
} else if (jeb->used_size || jeb->unchecked_size)
return BLK_STATE_PARTDIRTY;
else
return BLK_STATE_ALLDIRTY;
}
int jffs2_do_fill_super(struct super_block *sb, void *data, int silent)
{
struct jffs2_sb_info *c;
struct inode *root_i;
int ret;
size_t blocks;
c = JFFS2_SB_INFO(sb);
c->flash_size = c->mtd->size;
/*
* Check, if we have to concatenate physical blocks to larger virtual blocks
* to reduce the memorysize for c->blocks. (kmalloc allows max. 128K allocation)
*/
blocks = c->flash_size / c->mtd->erasesize;
while ((blocks * sizeof (struct jffs2_eraseblock)) > (128 * 1024))
blocks >>= 1;
c->sector_size = c->flash_size / blocks;
if (c->sector_size != c->mtd->erasesize)
printk(KERN_INFO "jffs2: Erase block size too small (%dKiB). Using virtual blocks size (%dKiB) instead\n",
c->mtd->erasesize / 1024, c->sector_size / 1024);
if (c->flash_size < 5*c->sector_size) {
printk(KERN_ERR "jffs2: Too few erase blocks (%d)\n", c->flash_size / c->sector_size);
return -EINVAL;
}
c->cleanmarker_size = sizeof(struct jffs2_unknown_node);
/* Joern -- stick alignment for weird 8-byte-page flash here */
if (jffs2_cleanmarker_oob(c)) {
/* NAND (or other bizarre) flash... do setup accordingly */
ret = jffs2_nand_flash_setup(c);
if (ret)
return ret;
}
c->inocache_list = kmalloc(INOCACHE_HASHSIZE * sizeof(struct jffs2_inode_cache *), GFP_KERNEL);
if (!c->inocache_list) {
ret = -ENOMEM;
goto out_wbuf;
}
memset(c->inocache_list, 0, INOCACHE_HASHSIZE * sizeof(struct jffs2_inode_cache *));
if ((ret = jffs2_do_mount_fs(c)))
goto out_inohash;
ret = -EINVAL;
D1(printk(KERN_DEBUG "jffs2_do_fill_super(): Getting root inode\n"));
root_i = iget(sb, 1);
if (is_bad_inode(root_i)) {
D1(printk(KERN_WARNING "get root inode failed\n"));
goto out_nodes;
}
D1(printk(KERN_DEBUG "jffs2_do_fill_super(): d_alloc_root()\n"));
sb->s_root = d_alloc_root(root_i);
if (!sb->s_root)
goto out_root_i;
#if LINUX_VERSION_CODE >= 0x20403
sb->s_maxbytes = 0xFFFFFFFF;
#endif
sb->s_blocksize = PAGE_CACHE_SIZE;
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
sb->s_magic = JFFS2_SUPER_MAGIC;
if (!(sb->s_flags & MS_RDONLY))
jffs2_start_garbage_collect_thread(c);
return 0;
out_root_i:
iput(root_i);
out_nodes:
jffs2_free_ino_caches(c);
jffs2_free_raw_node_refs(c);
kfree(c->blocks);
out_inohash:
kfree(c->inocache_list);
out_wbuf:
jffs2_nand_flash_cleanup(c);
return ret;
}
int jffs2_scan_medium(struct jffs2_sb_info *c)
{
int i, ret;
uint32_t empty_blocks = 0, bad_blocks = 0;
unsigned char *flashbuf = NULL;
uint32_t buf_size = 0;
struct jffs2_summary *s = NULL;
#ifndef __ECOS
size_t pointlen, try_size;
ret = mtd_point(c->mtd, 0, c->mtd->size, &pointlen,
(void **)&flashbuf, NULL);
if (!ret && pointlen < c->mtd->size) {
jffs2_dbg(1, "MTD point returned len too short: 0x%zx\n",
pointlen);
mtd_unpoint(c->mtd, 0, pointlen);
flashbuf = NULL;
}
if (ret && ret != -EOPNOTSUPP)
jffs2_dbg(1, "MTD point failed %d\n", ret);
#endif
if (!flashbuf) {
if (jffs2_cleanmarker_oob(c))
try_size = c->sector_size;
else
try_size = PAGE_SIZE;
jffs2_dbg(1, "Trying to allocate readbuf of %zu "
"bytes\n", try_size);
flashbuf = mtd_kmalloc_up_to(c->mtd, &try_size);
if (!flashbuf)
return -ENOMEM;
jffs2_dbg(1, "Allocated readbuf of %zu bytes\n",
try_size);
buf_size = (uint32_t)try_size;
}
if (jffs2_sum_active()) {
s = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL);
if (!s) {
JFFS2_WARNING("Can't allocate memory for summary\n");
ret = -ENOMEM;
goto out;
}
}
for (i=0; i<c->nr_blocks; i++) {
struct jffs2_eraseblock *jeb = &c->blocks[i];
cond_resched();
jffs2_sum_reset_collected(s);
ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset),
buf_size, s);
if (ret < 0)
goto out;
jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
switch(ret) {
case BLK_STATE_ALLFF:
empty_blocks++;
list_add(&jeb->list, &c->erase_pending_list);
c->nr_erasing_blocks++;
break;
case BLK_STATE_CLEANMARKER:
if (!jeb->dirty_size) {
list_add(&jeb->list, &c->free_list);
c->nr_free_blocks++;
} else {
jffs2_dbg(1, "Adding all-dirty block at 0x%08x to erase_pending_list\n",
jeb->offset);
list_add(&jeb->list, &c->erase_pending_list);
c->nr_erasing_blocks++;
}
break;
case BLK_STATE_CLEAN:
list_add(&jeb->list, &c->clean_list);
break;
case BLK_STATE_PARTDIRTY:
if (jeb->free_size > min_free(c) &&
(!c->nextblock || c->nextblock->free_size < jeb->free_size)) {
if (c->nextblock) {
ret = file_dirty(c, c->nextblock);
if (ret)
goto out;
jffs2_sum_reset_collected(c->summary);
}
jffs2_sum_move_collected(c, s);
jffs2_dbg(1, "%s(): new nextblock = 0x%08x\n",
__func__, jeb->offset);
c->nextblock = jeb;
} else {
ret = file_dirty(c, jeb);
if (ret)
goto out;
}
break;
case BLK_STATE_ALLDIRTY:
jffs2_dbg(1, "Erase block at 0x%08x is not formatted. It will be erased\n",
jeb->offset);
list_add(&jeb->list, &c->erase_pending_list);
c->nr_erasing_blocks++;
break;
case BLK_STATE_BADBLOCK:
jffs2_dbg(1, "Block at 0x%08x is bad\n", jeb->offset);
list_add(&jeb->list, &c->bad_list);
c->bad_size += c->sector_size;
c->free_size -= c->sector_size;
bad_blocks++;
break;
default:
pr_warn("%s(): unknown block state\n", __func__);
BUG();
}
}
if (c->nextblock && (c->nextblock->dirty_size)) {
c->nextblock->wasted_size += c->nextblock->dirty_size;
c->wasted_size += c->nextblock->dirty_size;
c->dirty_size -= c->nextblock->dirty_size;
c->nextblock->dirty_size = 0;
}
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
if (!jffs2_can_mark_obsolete(c) && c->wbuf_pagesize && c->nextblock && (c->nextblock->free_size % c->wbuf_pagesize)) {
uint32_t skip = c->nextblock->free_size % c->wbuf_pagesize;
jffs2_dbg(1, "%s(): Skipping %d bytes in nextblock to ensure page alignment\n",
__func__, skip);
jffs2_prealloc_raw_node_refs(c, c->nextblock, 1);
jffs2_scan_dirty_space(c, c->nextblock, skip);
}
#endif
if (c->nr_erasing_blocks) {
if ( !c->used_size && ((c->nr_free_blocks+empty_blocks+bad_blocks)!= c->nr_blocks || bad_blocks == c->nr_blocks) ) {
pr_notice("Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes\n");
pr_notice("empty_blocks %d, bad_blocks %d, c->nr_blocks %d\n",
empty_blocks, bad_blocks, c->nr_blocks);
ret = -EIO;
goto out;
}
spin_lock(&c->erase_completion_lock);
jffs2_garbage_collect_trigger(c);
spin_unlock(&c->erase_completion_lock);
}
ret = 0;
out:
if (buf_size)
kfree(flashbuf);
#ifndef __ECOS
else
mtd_unpoint(c->mtd, 0, c->mtd->size);
#endif
kfree(s);
return ret;
}
static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s) {
struct jffs2_unknown_node *node;
struct jffs2_unknown_node crcnode;
uint32_t ofs, prevofs, max_ofs;
uint32_t hdr_crc, buf_ofs, buf_len;
int err;
int noise = 0;
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
int cleanmarkerfound = 0;
#endif
ofs = jeb->offset;
prevofs = jeb->offset - 1;
jffs2_dbg(1, "%s(): Scanning block at 0x%x\n", __func__, ofs);
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
if (jffs2_cleanmarker_oob(c)) {
int ret;
if (mtd_block_isbad(c->mtd, jeb->offset))
return BLK_STATE_BADBLOCK;
ret = jffs2_check_nand_cleanmarker(c, jeb);
jffs2_dbg(2, "jffs_check_nand_cleanmarker returned %d\n", ret);
switch (ret) {
case 0: cleanmarkerfound = 1; break;
case 1: break;
default: return ret;
}
}
#endif
if (jffs2_sum_active()) {
struct jffs2_sum_marker *sm;
void *sumptr = NULL;
uint32_t sumlen;
if (!buf_size) {
sm = (void *)buf + c->sector_size - sizeof(*sm);
if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) {
sumptr = buf + je32_to_cpu(sm->offset);
sumlen = c->sector_size - je32_to_cpu(sm->offset);
}
} else {
if (c->wbuf_pagesize)
buf_len = c->wbuf_pagesize;
else
buf_len = sizeof(*sm);
err = jffs2_fill_scan_buf(c, buf + buf_size - buf_len,
jeb->offset + c->sector_size - buf_len,
buf_len);
if (err)
return err;
sm = (void *)buf + buf_size - sizeof(*sm);
if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) {
sumlen = c->sector_size - je32_to_cpu(sm->offset);
sumptr = buf + buf_size - sumlen;
if (sumlen > buf_size) {
sumptr = kmalloc(sumlen, GFP_KERNEL);
if (!sumptr)
return -ENOMEM;
memcpy(sumptr + sumlen - buf_len, buf + buf_size - buf_len, buf_len);
}
if (buf_len < sumlen) {
err = jffs2_fill_scan_buf(c, sumptr,
jeb->offset + c->sector_size - sumlen,
sumlen - buf_len);
if (err)
return err;
}
}
}
if (sumptr) {
err = jffs2_sum_scan_sumnode(c, jeb, sumptr, sumlen, &pseudo_random);
if (buf_size && sumlen > buf_size)
kfree(sumptr);
if (err)
return err;
}
}
buf_ofs = jeb->offset;
if (!buf_size) {
buf_len = c->sector_size;
} else {
buf_len = EMPTY_SCAN_SIZE(c->sector_size);
err = jffs2_fill_scan_buf(c, buf, buf_ofs, buf_len);
if (err)
return err;
}
ofs = 0;
max_ofs = EMPTY_SCAN_SIZE(c->sector_size);
while(ofs < max_ofs && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF)
ofs += 4;
if (ofs == max_ofs) {
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
if (jffs2_cleanmarker_oob(c)) {
int ret = jffs2_check_oob_empty(c, jeb, cleanmarkerfound);
jffs2_dbg(2, "jffs2_check_oob_empty returned %d\n",
ret);
switch (ret) {
case 0: return cleanmarkerfound ? BLK_STATE_CLEANMARKER : BLK_STATE_ALLFF;
case 1: return BLK_STATE_ALLDIRTY;
default: return ret;
}
}
#endif
jffs2_dbg(1, "Block at 0x%08x is empty (erased)\n",
jeb->offset);
if (c->cleanmarker_size == 0)
return BLK_STATE_CLEANMARKER;
else
return BLK_STATE_ALLFF;
}
if (ofs) {
jffs2_dbg(1, "Free space at %08x ends at %08x\n", jeb->offset,
jeb->offset + ofs);
if ((err = jffs2_prealloc_raw_node_refs(c, jeb, 1)))
return err;
if ((err = jffs2_scan_dirty_space(c, jeb, ofs)))
return err;
}
ofs += jeb->offset;
noise = 10;
dbg_summary("no summary found in jeb 0x%08x. Apply original scan.\n",jeb->offset);
scan_more:
while(ofs < jeb->offset + c->sector_size) {
jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
err = jffs2_prealloc_raw_node_refs(c, jeb, 2);
if (err)
return err;
cond_resched();
if (ofs & 3) {
pr_warn("Eep. ofs 0x%08x not word-aligned!\n", ofs);
ofs = PAD(ofs);
continue;
}
if (ofs == prevofs) {
pr_warn("ofs 0x%08x has already been seen. Skipping\n",
ofs);
if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
return err;
ofs += 4;
continue;
}
prevofs = ofs;
if (jeb->offset + c->sector_size < ofs + sizeof(*node)) {
jffs2_dbg(1, "Fewer than %zd bytes left to end of block. (%x+%x<%x+%zx) Not reading\n",
sizeof(struct jffs2_unknown_node),
jeb->offset, c->sector_size, ofs,
sizeof(*node));
if ((err = jffs2_scan_dirty_space(c, jeb, (jeb->offset + c->sector_size)-ofs)))
return err;
break;
}
if (buf_ofs + buf_len < ofs + sizeof(*node)) {
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
jffs2_dbg(1, "Fewer than %zd bytes (node header) left to end of buf. Reading 0x%x at 0x%08x\n",
sizeof(struct jffs2_unknown_node),
buf_len, ofs);
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
}
node = (struct jffs2_unknown_node *)&buf[ofs-buf_ofs];
if (*(uint32_t *)(&buf[ofs-buf_ofs]) == 0xffffffff) {
uint32_t inbuf_ofs;
uint32_t empty_start, scan_end;
empty_start = ofs;
ofs += 4;
scan_end = min_t(uint32_t, EMPTY_SCAN_SIZE(c->sector_size)/8, buf_len);
jffs2_dbg(1, "Found empty flash at 0x%08x\n", ofs);
more_empty:
inbuf_ofs = ofs - buf_ofs;
while (inbuf_ofs < scan_end) {
if (unlikely(*(uint32_t *)(&buf[inbuf_ofs]) != 0xffffffff)) {
pr_warn("Empty flash at 0x%08x ends at 0x%08x\n",
empty_start, ofs);
if ((err = jffs2_scan_dirty_space(c, jeb, ofs-empty_start)))
return err;
goto scan_more;
}
inbuf_ofs+=4;
ofs += 4;
}
jffs2_dbg(1, "Empty flash to end of buffer at 0x%08x\n",
ofs);
if (buf_ofs == jeb->offset && jeb->used_size == PAD(c->cleanmarker_size) &&
c->cleanmarker_size && !jeb->dirty_size && !ref_next(jeb->first_node)) {
jffs2_dbg(1, "%d bytes at start of block seems clean... assuming all clean\n",
EMPTY_SCAN_SIZE(c->sector_size));
return BLK_STATE_CLEANMARKER;
}
if (!buf_size && (scan_end != buf_len)) {
scan_end = buf_len;
goto more_empty;
}
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
if (!buf_len) {
jffs2_dbg(1, "Empty flash at %08x runs to end of block. Treating as free_space\n",
empty_start);
break;
}
scan_end = buf_len;
jffs2_dbg(1, "Reading another 0x%x at 0x%08x\n",
buf_len, ofs);
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
goto more_empty;
}
if (ofs == jeb->offset && je16_to_cpu(node->magic) == KSAMTIB_CIGAM_2SFFJ) {
pr_warn("Magic bitmask is backwards at offset 0x%08x. Wrong endian filesystem?\n",
ofs);
if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
return err;
ofs += 4;
continue;
}
if (je16_to_cpu(node->magic) == JFFS2_DIRTY_BITMASK) {
jffs2_dbg(1, "Dirty bitmask at 0x%08x\n", ofs);
if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
return err;
ofs += 4;
continue;
}
if (je16_to_cpu(node->magic) == JFFS2_OLD_MAGIC_BITMASK) {
pr_warn("Old JFFS2 bitmask found at 0x%08x\n", ofs);
pr_warn("You cannot use older JFFS2 filesystems with newer kernels\n");
if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
return err;
ofs += 4;
continue;
}
if (je16_to_cpu(node->magic) != JFFS2_MAGIC_BITMASK) {
noisy_printk(&noise, "%s(): Magic bitmask 0x%04x not found at 0x%08x: 0x%04x instead\n",
__func__,
JFFS2_MAGIC_BITMASK, ofs,
je16_to_cpu(node->magic));
if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
return err;
ofs += 4;
continue;
}
crcnode.magic = node->magic;
crcnode.nodetype = cpu_to_je16( je16_to_cpu(node->nodetype) | JFFS2_NODE_ACCURATE);
crcnode.totlen = node->totlen;
hdr_crc = crc32(0, &crcnode, sizeof(crcnode)-4);
if (hdr_crc != je32_to_cpu(node->hdr_crc)) {
noisy_printk(&noise, "%s(): Node at 0x%08x {0x%04x, 0x%04x, 0x%08x) has invalid CRC 0x%08x (calculated 0x%08x)\n",
__func__,
ofs, je16_to_cpu(node->magic),
je16_to_cpu(node->nodetype),
je32_to_cpu(node->totlen),
je32_to_cpu(node->hdr_crc),
hdr_crc);
if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
return err;
ofs += 4;
continue;
}
if (ofs + je32_to_cpu(node->totlen) > jeb->offset + c->sector_size) {
pr_warn("Node at 0x%08x with length 0x%08x would run over the end of the erase block\n",
ofs, je32_to_cpu(node->totlen));
pr_warn("Perhaps the file system was created with the wrong erase size?\n");
if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
return err;
ofs += 4;
continue;
}
if (!(je16_to_cpu(node->nodetype) & JFFS2_NODE_ACCURATE)) {
jffs2_dbg(2, "Node at 0x%08x is obsolete. Skipping\n",
ofs);
if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
return err;
ofs += PAD(je32_to_cpu(node->totlen));
continue;
}
switch(je16_to_cpu(node->nodetype)) {
case JFFS2_NODETYPE_INODE:
if (buf_ofs + buf_len < ofs + sizeof(struct jffs2_raw_inode)) {
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
jffs2_dbg(1, "Fewer than %zd bytes (inode node) left to end of buf. Reading 0x%x at 0x%08x\n",
sizeof(struct jffs2_raw_inode),
buf_len, ofs);
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
node = (void *)buf;
}
err = jffs2_scan_inode_node(c, jeb, (void *)node, ofs, s);
if (err) return err;
ofs += PAD(je32_to_cpu(node->totlen));
break;
case JFFS2_NODETYPE_DIRENT:
if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
jffs2_dbg(1, "Fewer than %d bytes (dirent node) left to end of buf. Reading 0x%x at 0x%08x\n",
je32_to_cpu(node->totlen), buf_len,
ofs);
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
node = (void *)buf;
}
err = jffs2_scan_dirent_node(c, jeb, (void *)node, ofs, s);
if (err) return err;
ofs += PAD(je32_to_cpu(node->totlen));
break;
#ifdef CONFIG_JFFS2_FS_XATTR
case JFFS2_NODETYPE_XATTR:
if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
jffs2_dbg(1, "Fewer than %d bytes (xattr node) left to end of buf. Reading 0x%x at 0x%08x\n",
je32_to_cpu(node->totlen), buf_len,
ofs);
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
node = (void *)buf;
}
err = jffs2_scan_xattr_node(c, jeb, (void *)node, ofs, s);
if (err)
return err;
ofs += PAD(je32_to_cpu(node->totlen));
break;
case JFFS2_NODETYPE_XREF:
if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
jffs2_dbg(1, "Fewer than %d bytes (xref node) left to end of buf. Reading 0x%x at 0x%08x\n",
je32_to_cpu(node->totlen), buf_len,
ofs);
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
node = (void *)buf;
}
err = jffs2_scan_xref_node(c, jeb, (void *)node, ofs, s);
if (err)
return err;
ofs += PAD(je32_to_cpu(node->totlen));
break;
#endif
case JFFS2_NODETYPE_CLEANMARKER:
jffs2_dbg(1, "CLEANMARKER node found at 0x%08x\n", ofs);
if (je32_to_cpu(node->totlen) != c->cleanmarker_size) {
pr_notice("CLEANMARKER node found at 0x%08x has totlen 0x%x != normal 0x%x\n",
ofs, je32_to_cpu(node->totlen),
c->cleanmarker_size);
if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node)))))
return err;
ofs += PAD(sizeof(struct jffs2_unknown_node));
} else if (jeb->first_node) {
pr_notice("CLEANMARKER node found at 0x%08x, not first node in block (0x%08x)\n",
ofs, jeb->offset);
if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node)))))
return err;
ofs += PAD(sizeof(struct jffs2_unknown_node));
} else {
jffs2_link_node_ref(c, jeb, ofs | REF_NORMAL, c->cleanmarker_size, NULL);
ofs += PAD(c->cleanmarker_size);
}
break;
case JFFS2_NODETYPE_PADDING:
if (jffs2_sum_active())
jffs2_sum_add_padding_mem(s, je32_to_cpu(node->totlen));
if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
return err;
ofs += PAD(je32_to_cpu(node->totlen));
break;
default:
switch (je16_to_cpu(node->nodetype) & JFFS2_COMPAT_MASK) {
case JFFS2_FEATURE_ROCOMPAT:
pr_notice("Read-only compatible feature node (0x%04x) found at offset 0x%08x\n",
je16_to_cpu(node->nodetype), ofs);
c->flags |= JFFS2_SB_FLAG_RO;
if (!(jffs2_is_readonly(c)))
return -EROFS;
if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
return err;
ofs += PAD(je32_to_cpu(node->totlen));
break;
case JFFS2_FEATURE_INCOMPAT:
pr_notice("Incompatible feature node (0x%04x) found at offset 0x%08x\n",
je16_to_cpu(node->nodetype), ofs);
return -EINVAL;
case JFFS2_FEATURE_RWCOMPAT_DELETE:
jffs2_dbg(1, "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n",
je16_to_cpu(node->nodetype), ofs);
if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
return err;
ofs += PAD(je32_to_cpu(node->totlen));
break;
case JFFS2_FEATURE_RWCOMPAT_COPY: {
jffs2_dbg(1, "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n",
je16_to_cpu(node->nodetype), ofs);
jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(node->totlen)), NULL);
jffs2_sum_disable_collecting(s);
ofs += PAD(je32_to_cpu(node->totlen));
break;
}
}
}
}
if (jffs2_sum_active()) {
if (PAD(s->sum_size + JFFS2_SUMMARY_FRAME_SIZE) > jeb->free_size) {
dbg_summary("There is not enough space for "
"summary information, disabling for this jeb!\n");
jffs2_sum_disable_collecting(s);
}
}
jffs2_dbg(1, "Block at 0x%08x: free 0x%08x, dirty 0x%08x, unchecked 0x%08x, used 0x%08x, wasted 0x%08x\n",
jeb->offset, jeb->free_size, jeb->dirty_size,
jeb->unchecked_size, jeb->used_size, jeb->wasted_size);
if (jeb->wasted_size) {
jeb->dirty_size += jeb->wasted_size;
c->dirty_size += jeb->wasted_size;
c->wasted_size -= jeb->wasted_size;
jeb->wasted_size = 0;
}
return jffs2_scan_classify_jeb(c, jeb);
}
int jffs2_do_fill_super(struct super_block *sb, void *data, int silent)
{
struct jffs2_sb_info *c;
struct inode *root_i;
int ret;
size_t blocks;
c = JFFS2_SB_INFO(sb);
c->flash_size = c->mtd->size;
/*
* Check, if we have to concatenate physical blocks to larger virtual blocks
* to reduce the memorysize for c->blocks. (kmalloc allows max. 128K allocation)
*/
blocks = c->flash_size / c->mtd->erasesize;
while ((blocks * sizeof (struct jffs2_eraseblock)) > (128 * 1024))
blocks >>= 1;
c->sector_size = c->flash_size / blocks;
if (c->sector_size != c->mtd->erasesize)
printk(KERN_INFO "jffs2: Erase block size too small (%dKiB). Using virtual blocks size (%dKiB) instead\n",
c->mtd->erasesize / 1024, c->sector_size / 1024);
if (c->flash_size < 5*c->sector_size) {
printk(KERN_ERR "jffs2: Too few erase blocks (%d)\n", c->flash_size / c->sector_size);
return -EINVAL;
}
c->cleanmarker_size = sizeof(struct jffs2_unknown_node);
/* Joern -- stick alignment for weird 8-byte-page flash here */
if (jffs2_cleanmarker_oob(c)) {
/* Cleanmarker is out-of-band, so inline size zero */
c->cleanmarker_size = 0;
}
if (c->mtd->type == MTD_NANDFLASH) {
/* Initialise write buffer */
c->wbuf_pagesize = c->mtd->oobblock;
c->wbuf_ofs = 0xFFFFFFFF;
c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
if (!c->wbuf)
return -ENOMEM;
/* Initialise process for timed wbuf flush */
INIT_WORK(&c->wbuf_task,(void*) jffs2_wbuf_process, (void *)c);
/* Initialise timer for timed wbuf flush */
init_timer(&c->wbuf_timer);
c->wbuf_timer.function = jffs2_wbuf_timeout;
c->wbuf_timer.data = (unsigned long) c;
}
c->inocache_list = kmalloc(INOCACHE_HASHSIZE * sizeof(struct jffs2_inode_cache *), GFP_KERNEL);
if (!c->inocache_list) {
ret = -ENOMEM;
goto out_wbuf;
}
memset(c->inocache_list, 0, INOCACHE_HASHSIZE * sizeof(struct jffs2_inode_cache *));
if ((ret = jffs2_do_mount_fs(c)))
goto out_inohash;
ret = -EINVAL;
D1(printk(KERN_DEBUG "jffs2_do_fill_super(): Getting root inode\n"));
root_i = iget(sb, 1);
if (is_bad_inode(root_i)) {
D1(printk(KERN_WARNING "get root inode failed\n"));
goto out_nodes;
}
D1(printk(KERN_DEBUG "jffs2_do_fill_super(): d_alloc_root()\n"));
sb->s_root = d_alloc_root(root_i);
if (!sb->s_root)
goto out_root_i;
#if LINUX_VERSION_CODE >= 0x20403
sb->s_maxbytes = 0xFFFFFFFF;
#endif
sb->s_blocksize = PAGE_CACHE_SIZE;
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
sb->s_magic = JFFS2_SUPER_MAGIC;
if (!(sb->s_flags & MS_RDONLY))
jffs2_start_garbage_collect_thread(c);
return 0;
out_root_i:
iput(root_i);
out_nodes:
jffs2_free_ino_caches(c);
jffs2_free_raw_node_refs(c);
kfree(c->blocks);
out_inohash:
kfree(c->inocache_list);
out_wbuf:
if (c->wbuf)
kfree(c->wbuf);
return ret;
}
static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s) {
struct jffs2_unknown_node *node;
struct jffs2_unknown_node crcnode;
struct jffs2_sum_marker *sm;
uint32_t ofs, prevofs;
uint32_t hdr_crc, buf_ofs, buf_len;
int err;
int noise = 0;
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
int cleanmarkerfound = 0;
#endif
ofs = jeb->offset;
prevofs = jeb->offset - 1;
D1(printk(KERN_DEBUG "jffs2_scan_eraseblock(): Scanning block at 0x%x\n", ofs));
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
if (jffs2_cleanmarker_oob(c)) {
int ret = jffs2_check_nand_cleanmarker(c, jeb);
D2(printk(KERN_NOTICE "jffs_check_nand_cleanmarker returned %d\n",ret));
/* Even if it's not found, we still scan to see
if the block is empty. We use this information
to decide whether to erase it or not. */
switch (ret) {
case 0: cleanmarkerfound = 1; break;
case 1: break;
case 2: return BLK_STATE_BADBLOCK;
case 3: return BLK_STATE_ALLDIRTY; /* Block has failed to erase min. once */
default: return ret;
}
}
#endif
if (jffs2_sum_active()) {
sm = kmalloc(sizeof(struct jffs2_sum_marker), GFP_KERNEL);
if (!sm) {
return -ENOMEM;
}
err = jffs2_fill_scan_buf(c, (unsigned char *) sm, jeb->offset + c->sector_size -
sizeof(struct jffs2_sum_marker), sizeof(struct jffs2_sum_marker));
if (err) {
kfree(sm);
return err;
}
if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC ) {
err = jffs2_sum_scan_sumnode(c, jeb, je32_to_cpu(sm->offset), &pseudo_random);
if (err) {
kfree(sm);
return err;
}
}
kfree(sm);
ofs = jeb->offset;
prevofs = jeb->offset - 1;
}
buf_ofs = jeb->offset;
if (!buf_size) {
buf_len = c->sector_size;
if (jffs2_sum_active()) {
/* must reread because of summary test */
err = jffs2_fill_scan_buf(c, buf, buf_ofs, buf_len);
if (err)
return err;
}
} else {
buf_len = EMPTY_SCAN_SIZE(c->sector_size);
err = jffs2_fill_scan_buf(c, buf, buf_ofs, buf_len);
if (err)
return err;
}
/* We temporarily use 'ofs' as a pointer into the buffer/jeb */
ofs = 0;
/* Scan only 4KiB of 0xFF before declaring it's empty */
while(ofs < EMPTY_SCAN_SIZE(c->sector_size) && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF)
ofs += 4;
if (ofs == EMPTY_SCAN_SIZE(c->sector_size)) {
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
if (jffs2_cleanmarker_oob(c)) {
/* scan oob, take care of cleanmarker */
int ret = jffs2_check_oob_empty(c, jeb, cleanmarkerfound);
D2(printk(KERN_NOTICE "jffs2_check_oob_empty returned %d\n",ret));
switch (ret) {
case 0: return cleanmarkerfound ? BLK_STATE_CLEANMARKER : BLK_STATE_ALLFF;
case 1: return BLK_STATE_ALLDIRTY;
default: return ret;
}
}
#endif
D1(printk(KERN_DEBUG "Block at 0x%08x is empty (erased)\n", jeb->offset));
if (c->cleanmarker_size == 0)
return BLK_STATE_CLEANMARKER; /* don't bother with re-erase */
else
return BLK_STATE_ALLFF; /* OK to erase if all blocks are like this */
}
if (ofs) {
D1(printk(KERN_DEBUG "Free space at %08x ends at %08x\n", jeb->offset,
jeb->offset + ofs));
DIRTY_SPACE(ofs);
}
/* Now ofs is a complete physical flash offset as it always was... */
ofs += jeb->offset;
noise = 10;
dbg_summary("no summary found in jeb 0x%08x. Apply original scan.\n",jeb->offset);
scan_more:
while(ofs < jeb->offset + c->sector_size) {
jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
cond_resched();
if (ofs & 3) {
printk(KERN_WARNING "Eep. ofs 0x%08x not word-aligned!\n", ofs);
ofs = PAD(ofs);
continue;
}
if (ofs == prevofs) {
printk(KERN_WARNING "ofs 0x%08x has already been seen. Skipping\n", ofs);
DIRTY_SPACE(4);
ofs += 4;
continue;
}
prevofs = ofs;
if (jeb->offset + c->sector_size < ofs + sizeof(*node)) {
D1(printk(KERN_DEBUG "Fewer than %zd bytes left to end of block. (%x+%x<%x+%zx) Not reading\n", sizeof(struct jffs2_unknown_node),
jeb->offset, c->sector_size, ofs, sizeof(*node)));
DIRTY_SPACE((jeb->offset + c->sector_size)-ofs);
break;
}
if (buf_ofs + buf_len < ofs + sizeof(*node)) {
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
D1(printk(KERN_DEBUG "Fewer than %zd bytes (node header) left to end of buf. Reading 0x%x at 0x%08x\n",
sizeof(struct jffs2_unknown_node), buf_len, ofs));
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
}
node = (struct jffs2_unknown_node *)&buf[ofs-buf_ofs];
if (*(uint32_t *)(&buf[ofs-buf_ofs]) == 0xffffffff) {
uint32_t inbuf_ofs;
uint32_t empty_start;
empty_start = ofs;
ofs += 4;
D1(printk(KERN_DEBUG "Found empty flash at 0x%08x\n", ofs));
more_empty:
inbuf_ofs = ofs - buf_ofs;
while (inbuf_ofs < buf_len) {
if (*(uint32_t *)(&buf[inbuf_ofs]) != 0xffffffff) {
printk(KERN_WARNING "Empty flash at 0x%08x ends at 0x%08x\n",
empty_start, ofs);
DIRTY_SPACE(ofs-empty_start);
goto scan_more;
}
inbuf_ofs+=4;
ofs += 4;
}
/* Ran off end. */
D1(printk(KERN_DEBUG "Empty flash to end of buffer at 0x%08x\n", ofs));
/* If we're only checking the beginning of a block with a cleanmarker,
bail now */
if (buf_ofs == jeb->offset && jeb->used_size == PAD(c->cleanmarker_size) &&
c->cleanmarker_size && !jeb->dirty_size && !jeb->first_node->next_phys) {
D1(printk(KERN_DEBUG "%d bytes at start of block seems clean... assuming all clean\n", EMPTY_SCAN_SIZE(c->sector_size)));
return BLK_STATE_CLEANMARKER;
}
/* See how much more there is to read in this eraseblock... */
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
if (!buf_len) {
/* No more to read. Break out of main loop without marking
this range of empty space as dirty (because it's not) */
D1(printk(KERN_DEBUG "Empty flash at %08x runs to end of block. Treating as free_space\n",
empty_start));
break;
}
D1(printk(KERN_DEBUG "Reading another 0x%x at 0x%08x\n", buf_len, ofs));
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
goto more_empty;
}
if (ofs == jeb->offset && je16_to_cpu(node->magic) == KSAMTIB_CIGAM_2SFFJ) {
printk(KERN_WARNING "Magic bitmask is backwards at offset 0x%08x. Wrong endian filesystem?\n", ofs);
DIRTY_SPACE(4);
ofs += 4;
continue;
}
if (je16_to_cpu(node->magic) == JFFS2_DIRTY_BITMASK) {
D1(printk(KERN_DEBUG "Dirty bitmask at 0x%08x\n", ofs));
DIRTY_SPACE(4);
ofs += 4;
continue;
}
if (je16_to_cpu(node->magic) == JFFS2_OLD_MAGIC_BITMASK) {
printk(KERN_WARNING "Old JFFS2 bitmask found at 0x%08x\n", ofs);
printk(KERN_WARNING "You cannot use older JFFS2 filesystems with newer kernels\n");
DIRTY_SPACE(4);
ofs += 4;
continue;
}
if (je16_to_cpu(node->magic) != JFFS2_MAGIC_BITMASK) {
/* OK. We're out of possibilities. Whinge and move on */
noisy_printk(&noise, "jffs2_scan_eraseblock(): Magic bitmask 0x%04x not found at 0x%08x: 0x%04x instead\n",
JFFS2_MAGIC_BITMASK, ofs,
je16_to_cpu(node->magic));
DIRTY_SPACE(4);
ofs += 4;
continue;
}
/* We seem to have a node of sorts. Check the CRC */
crcnode.magic = node->magic;
crcnode.nodetype = cpu_to_je16( je16_to_cpu(node->nodetype) | JFFS2_NODE_ACCURATE);
crcnode.totlen = node->totlen;
hdr_crc = crc32(0, &crcnode, sizeof(crcnode)-4);
if (hdr_crc != je32_to_cpu(node->hdr_crc)) {
noisy_printk(&noise, "jffs2_scan_eraseblock(): Node at 0x%08x {0x%04x, 0x%04x, 0x%08x) has invalid CRC 0x%08x (calculated 0x%08x)\n",
ofs, je16_to_cpu(node->magic),
je16_to_cpu(node->nodetype),
je32_to_cpu(node->totlen),
je32_to_cpu(node->hdr_crc),
hdr_crc);
DIRTY_SPACE(4);
ofs += 4;
continue;
}
if (ofs + je32_to_cpu(node->totlen) >
jeb->offset + c->sector_size) {
/* Eep. Node goes over the end of the erase block. */
printk(KERN_WARNING "Node at 0x%08x with length 0x%08x would run over the end of the erase block\n",
ofs, je32_to_cpu(node->totlen));
printk(KERN_WARNING "Perhaps the file system was created with the wrong erase size?\n");
DIRTY_SPACE(4);
ofs += 4;
continue;
}
if (!(je16_to_cpu(node->nodetype) & JFFS2_NODE_ACCURATE)) {
/* Wheee. This is an obsoleted node */
D2(printk(KERN_DEBUG "Node at 0x%08x is obsolete. Skipping\n", ofs));
DIRTY_SPACE(PAD(je32_to_cpu(node->totlen)));
ofs += PAD(je32_to_cpu(node->totlen));
continue;
}
switch(je16_to_cpu(node->nodetype)) {
case JFFS2_NODETYPE_INODE:
if (buf_ofs + buf_len < ofs + sizeof(struct jffs2_raw_inode)) {
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
D1(printk(KERN_DEBUG "Fewer than %zd bytes (inode node) left to end of buf. Reading 0x%x at 0x%08x\n",
sizeof(struct jffs2_raw_inode), buf_len, ofs));
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
node = (void *)buf;
}
err = jffs2_scan_inode_node(c, jeb, (void *)node, ofs, s);
if (err) return err;
ofs += PAD(je32_to_cpu(node->totlen));
break;
case JFFS2_NODETYPE_DIRENT:
if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
D1(printk(KERN_DEBUG "Fewer than %d bytes (dirent node) left to end of buf. Reading 0x%x at 0x%08x\n",
je32_to_cpu(node->totlen), buf_len, ofs));
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
node = (void *)buf;
}
err = jffs2_scan_dirent_node(c, jeb, (void *)node, ofs, s);
if (err) return err;
ofs += PAD(je32_to_cpu(node->totlen));
break;
case JFFS2_NODETYPE_CLEANMARKER:
D1(printk(KERN_DEBUG "CLEANMARKER node found at 0x%08x\n", ofs));
if (je32_to_cpu(node->totlen) != c->cleanmarker_size) {
printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x has totlen 0x%x != normal 0x%x\n",
ofs, je32_to_cpu(node->totlen), c->cleanmarker_size);
DIRTY_SPACE(PAD(sizeof(struct jffs2_unknown_node)));
ofs += PAD(sizeof(struct jffs2_unknown_node));
} else if (jeb->first_node) {
printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x, not first node in block (0x%08x)\n", ofs, jeb->offset);
DIRTY_SPACE(PAD(sizeof(struct jffs2_unknown_node)));
ofs += PAD(sizeof(struct jffs2_unknown_node));
} else {
struct jffs2_raw_node_ref *marker_ref = jffs2_alloc_raw_node_ref();
if (!marker_ref) {
printk(KERN_NOTICE "Failed to allocate node ref for clean marker\n");
return -ENOMEM;
}
marker_ref->next_in_ino = NULL;
marker_ref->next_phys = NULL;
marker_ref->flash_offset = ofs | REF_NORMAL;
marker_ref->__totlen = c->cleanmarker_size;
jeb->first_node = jeb->last_node = marker_ref;
USED_SPACE(PAD(c->cleanmarker_size));
ofs += PAD(c->cleanmarker_size);
}
break;
case JFFS2_NODETYPE_PADDING:
if (jffs2_sum_active())
jffs2_sum_add_padding_mem(s, je32_to_cpu(node->totlen));
DIRTY_SPACE(PAD(je32_to_cpu(node->totlen)));
ofs += PAD(je32_to_cpu(node->totlen));
break;
default:
switch (je16_to_cpu(node->nodetype) & JFFS2_COMPAT_MASK) {
case JFFS2_FEATURE_ROCOMPAT:
printk(KERN_NOTICE "Read-only compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs);
c->flags |= JFFS2_SB_FLAG_RO;
if (!(jffs2_is_readonly(c)))
return -EROFS;
DIRTY_SPACE(PAD(je32_to_cpu(node->totlen)));
ofs += PAD(je32_to_cpu(node->totlen));
break;
case JFFS2_FEATURE_INCOMPAT:
printk(KERN_NOTICE "Incompatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs);
return -EINVAL;
case JFFS2_FEATURE_RWCOMPAT_DELETE:
D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs));
DIRTY_SPACE(PAD(je32_to_cpu(node->totlen)));
ofs += PAD(je32_to_cpu(node->totlen));
break;
case JFFS2_FEATURE_RWCOMPAT_COPY:
D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs));
USED_SPACE(PAD(je32_to_cpu(node->totlen)));
ofs += PAD(je32_to_cpu(node->totlen));
break;
}
}
}
if (jffs2_sum_active()) {
if (PAD(s->sum_size + JFFS2_SUMMARY_FRAME_SIZE) > jeb->free_size) {
dbg_summary("There is not enough space for "
"summary information, disabling for this jeb!\n");
jffs2_sum_disable_collecting(s);
}
}
D1(printk(KERN_DEBUG "Block at 0x%08x: free 0x%08x, dirty 0x%08x, unchecked 0x%08x, used 0x%08x\n", jeb->offset,
jeb->free_size, jeb->dirty_size, jeb->unchecked_size, jeb->used_size));
/* mark_node_obsolete can add to wasted !! */
if (jeb->wasted_size) {
jeb->dirty_size += jeb->wasted_size;
c->dirty_size += jeb->wasted_size;
c->wasted_size -= jeb->wasted_size;
jeb->wasted_size = 0;
}
return jffs2_scan_classify_jeb(c, jeb);
}